Design of a high-intensity ultrasound reactor

Johansson, Örjan; Pamidi, Taraka Rama Krishna; Löfqvist, Torbjörn

doi:10.1109/ultsym.2017.8091660

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Fig. 3 shows the numerically and experimentally optimized reactor concept [14] , [20] . The reactor was FE-modeled in 3D using COMSOL Multiphysics®.…”

Section: Methodsmentioning

confidence: 99%

“…The reactor was FE-modeled in 3D using COMSOL Multiphysics®. By extensive numerical optimization, four different resonance phenomena were unified to a coupled resonance [14] , [21] , [27] . The resonances relate to the sonotrodes; bending wave modes of the reactor wall structure; radial mode of the cylindrical cross-section of the water volume; and the longitudinal standing wave of the water jacket volume.…”

Section: Methodsmentioning

confidence: 99%

“…The reactor principle in this investigation is based on a two-step cavitation procedure [14] . First cavitation bubbles are initiated by flow through an orifice and then collapsed by high-intensity ultrasound in a resonant flow through reactor volume.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of tungsten from scheelite using hydrodynamic and acoustic cavitation

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“…Fig. 3 shows the numerically and experimentally optimized reactor concept [14] , [20] . The reactor was FE-modeled in 3D using COMSOL Multiphysics®.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Titanium ultrasonic reactor tuned to 500 kHz

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2023

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This study describes the design considerations, principles, and performance of a water-filled ultrasonic reactor formed by a 125 mm size titanium cylinder covered with 67 piezoelectric transducers, tuned as a system for peak emissions at 500 kHz. The total acoustic power measured by a radiation force balance is 107 W. The sound intensity is amplified by the cavity and focusing attributes of the cylindrical wall. The reactor can generate ZnO nanoparticles from ZnAc2 solution, and the nanoparticle are found fixated to an epoxy substrate as observed under a scanning transmission electron microscope. These indications are similar to a sonochemical reaction reported at 20 kHz, which validates that inertial cavitation has been reached. The titanium wall has a transmission efficiency of 51% compared to a well-matched POCO graphite-resin layer. The efficiency exceeds the value of 17% expected from a naïve calculation based on the impedance-translation theorem. The problem of optimal emission from a piezoelectric source is more complex than a simple reduction of reflections at the transducer boundary. COMSOL simulations show that the condition for optimal transmission requires consideration of elasticity and piezoelectric charge matrices instead of acoustic impedance. Approximated analytical calculation is suggested as a preliminary guidance for design of an optimal matching layer.

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Design of a high-intensity ultrasound reactor

Cited by 3 publications

References 4 publications

Extraction of tungsten from scheelite using hydrodynamic and acoustic cavitation

Extraction of tungsten from scheelite using hydrodynamic and acoustic cavitation

Developing high intensity ultrasonic cleaning (HIUC) for post-processing additively manufactured metal components

Titanium ultrasonic reactor tuned to 500 kHz

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